1/*
2 * Copyright (c) 2004 Daniel McNeil <daniel@osdl.org>
3 *               2004 Open Source Development Lab
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Module: .c
19 */
20
21/*
22 * Change History:
23 *
24 * 2/2004  Marty Ridgeway (mridge@us.ibm.com) Changes to adapt to LTP
25 *
26 */
27#define _GNU_SOURCE
28
29#include <stdlib.h>
30#include <sys/types.h>
31#include <signal.h>
32#include <fcntl.h>
33#include <stdio.h>
34#include <unistd.h>
35
36#include "common_checkzero.h"
37
38int read_eof(char *filename)
39{
40	int fd;
41	int i;
42	int r;
43	char buf[4096];
44
45	if ((fd = open(filename, O_RDWR)) < 0) {
46		fprintf(stderr, "can't open file %s \n", filename);
47		exit(1);
48	}
49
50	for (i = 0; i < 100000; i++) {
51		off_t offset;
52		char *bufoff;
53
54		offset = lseek(fd, 4096, SEEK_END);
55		r = write(fd, "A", 1);
56
57		offset = lseek(fd, offset - 4096, SEEK_SET);
58
59		r = read(fd, buf, 4096);
60		if (r > 0) {
61			if ((bufoff = check_zero(buf, r))) {
62				fprintf(stderr, "non-zero read at offset %p\n",
63					offset + bufoff);
64				exit(1);
65			}
66		}
67	}
68	fprintf(stderr, "read_checkzero done\n");
69	return 0;
70}
71
72int main(int argc, char **argv)
73{
74	if (argc < 2) {
75		printf("You must pass a filename to the test \n");
76		exit(1);
77	}
78
79	char *filename = argv[1];
80
81	read_eof(filename);
82
83	return 0;
84}
85